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Note 2 - Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended
March 31,
Net sales of:   2019   2018
Products   $
46,410
     $
42,226
  
Tooling and Machinery    
645
      
410
  
Engineering services    
273
      
295
  
Total net sales   $
47,328
     $
42,931
  
Contract with Customer, Asset and Liability [Table Text Block]
    Contract Liabilities
    Three Months Ended
March 31,
    2019   2018
Deferred revenue - beginning of period   $
2,507
     $
871
  
Acquired in Dielectrics business combination    
-
      
2,175
  
Increases due to consideration received from customers    
991
      
685
  
Revenue recognized    
(526
 )    
(601
 )
Deferred revenue - end of period   $
2,972
     $
3,130
  
    Contract Assets
    Three Months Ended
March 31,
2019
Unbilled Receivables - beginning of period   $
65
  
Decreases due to customer invoicing    
(106
 )
Increases due to revenue recognized - not invoiced to customers    
85
  
Unbilled Receivables - end of period   $
44